Electronic structure engineering through Fe-doping CoP enables hydrogen evolution coupled with electro-Fenton. (June 2021)

• Record Type: Journal Article
• Authors: Wang, Honglei; Wang, Yuchao; Zhang, Jiangwei; Liu, Xin; Tao, Shengyang
• Is Part Of: Nano energy. Volume 84(2021)
• Publication Date: 2021-06
• Subjects: Flower-like CoFeP -- Electro-Fenton -- Carrier density -- Hydrogen evolution reaction -- Electrochemical flow reactor; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.105943
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Improving the utilization of energy in the electrochemical hydrogen evolution reaction (HER) is a meaningful but challenging task. Coupling the HER with electro-Fenton instead of oxygen evolution is an effective method. For high-efficiency electro-Fenton, herein, the electron structure of CoP/C was optimized due to the doping of Fe to improve the carrier density of CoFeP/C and produce more hydroxyl radicals (·OH), which was confirmed by both characterization and density functional theory calculation (DFT) analysis. Meanwhile, CoP/C exhibits excellent HER activity with an overpotential of 42.1 mV (vs. RHE) at 10 mA cm −2 and a Tafel slope of 59 mV dec −1 because of the favorable electron transfer vector spiny structure and the high content of P element. The electrochemical flow reactor employing CoP/C for cathodic H2 and adopting CoFeP/C for anodic electro-Fenton requires only a low constant voltage of 1.68 V. For optimal electrode adjustment, electro-Fenton can be considered as an ideal oxidation reaction to promote the energy efficiency in the rationally designed reactor. Combination HER with electro-Fenton supports that our designed reactor has high potential in the fields of sustainable energy and environmental remediation. Graphical Abstract: The asymmetric electrodes CoP and Fe-doped CoP as high efficiency hydrogen evolution coupled with electro-Fenton. ga1 Highlights: Coupling the HER with electro-Fenton is an effective method, which improving the utilization of energy. Fe-doping modulates the carrier densities of catalyst and improves the electro-Fenton activity. The favorable mass transfer process in the flow electrochemical reactor was explained by computational fluid dynamics. Reasonable mechanism for the enhanced electro-Fenton activity was well explained.